EP 1241779 A3 20030716 - Receiver used in multi-carrier reception
Title (en)
Receiver used in multi-carrier reception
Title (de)
Empfänger für Mehrträgersignale
Title (fr)
Récepteur à multiples porteuses
Publication
Application
Priority
US 80143301 A 20010307
Abstract (en)
[origin: EP1241779A2] In accordance with a method for single-carrier and multi-carrier reception, the following steps are executed: downconverting a received RF signal to in-phase (I) and quadrature (Q) channel signals each containing a plurality of sub-carriers at a low intermediate frequency (low-IF) and, if required, one sub-carrier or a single carrier centered around 0 Hz; filtering interfering signals outside of a frequency band of interest with analog lowpass filters in the I and Q channels; converting the I and Q channel signals to digital representations thereof; in the multi-carrier reception case, separating sub-carriers that are images of one another by quadrature downmixing the digital representations of the I and Q channel signals to baseband in the digital domain; and digitally adding or subtracting resulting I and Q signals to obtain one or both of an upper sideband and a lower sideband containing desired ones of the multi-carriers. For a symmetric multi-carrier reception case the step of downconverting includes a step of tuning a local oscillator to a center frequency of a group of sub-carriers, while for an asymmetric multi-carrier reception case the step of downconverting includes a step of tuning a local oscillator between a middlemost sub-carrier and its interfering adjacent channel.
IPC 1-7
IPC 8 full level
H04L 27/227 (2006.01); H03D 3/00 (2006.01); H03D 7/16 (2006.01); H04J 1/00 (2006.01); H04L 5/06 (2006.01)
CPC (source: EP US)
H03D 3/009 (2013.01 - EP US); H03D 7/166 (2013.01 - EP US); H04L 5/06 (2013.01 - EP US)
Citation (search report)
- [XY] WO 9914863 A1 19990325 - ITALTEL SPA [IT], et al
- [Y] US 6009317 A 19991228 - WYNN STEPHEN R [US]
- [Y] PATENT ABSTRACTS OF JAPAN vol. 1999, no. 13 30 November 1999 (1999-11-30) & US 6219534 B1 20010417 - TORII KENICHI [JP]
- [A] GREEN R ET AL: "HIGH PERFORMANCE DIRECT CONVERSION", ELECTRONICS WORLD AND WIRELESS WORLD, REED BUSINESS PUBLISHING, SUTTON, SURREY, GB, vol. 102, no. 1718, 1996, pages 18 - 22, XP000552237, ISSN: 0959-8332
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
EP 1241779 A2 20020918; EP 1241779 A3 20030716; CN 1373563 A 20021009; JP 2002280988 A 20020927; US 2002127982 A1 20020912
DOCDB simple family (application)
EP 01309127 A 20011026; CN 01145229 A 20011226; JP 2001357857 A 20011122; US 80143301 A 20010307